For a band that have - over the course of their five studio albums - always been known for a level of complexity, Tool's most eagerly awaited record yet, taking no less than 13 years to materialise, is staggering in its depth. Worth the wait, and then some, those looking for wherever progressive rock genius has been hiding can consider the search over. We've found it. There's just so much happening here. "Pneuma" may be the trophy piece, its beautiful chords spiralling into sinister refrains and choruses. "Descending" grows its way from ambient opening to powerhouse guitars. "Chocolate Chip Trip", something of a curveball, introduces noodling improv-sounding sections to the melting pot. An epic in all ways of looking at things, although one that's remarkably easy to consume, "Fear Inoculum" marks the reawakening of giants with a score that will make anyone walk proud.